#### 11th Standard Chemistry English Medium Free Online Test Book Back 1 Mark Questions with Answer Key - Part Three

11th Standard

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Chemistry

Time : 00:10:00 Hrs
Total Marks : 10

10 x 1 = 10
1. When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at 273 K at 1 atm the moles of HCl (g), formed is equal to

(a)

2 moles of HCI (g)

(b)

0.5 moles of HCI (g)

(c)

1.5 moles of HCI (g)

(d)

1 moles of HCI (g)

2. For d-electron, the orbital angular momentum is

(a)

$\frac { \sqrt { 2 } h }{ 2\pi }$

(b)

$\\ \frac { \sqrt { 2h } }{ 2\pi }$

(c)

$\frac { \sqrt { 2\times 4 } h }{ 2\pi }$

(d)

$\frac { \sqrt { 2\times 4 } h }{ 2\pi }$

3. Identify the wrong statement.

(a)

Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius

(b)

Amongst isoelectric species greater the negative charge on the anion, larger is the ionic radius

(c)

Atomic radius of the elements increases as one moves down the first group of the periodic table

(d)

Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.

4. Zeolite used to soften hardness of water is hydrated

(a)

Sodium aluminium silicate

(b)

Calcium aluminium silicate

(c)

Zinc aluminium borate

(d)

Lithium aluminium hydride

5. In a closed room of 1000 m3 a perfume bottle is opened up. The room develops smell. This is due to which property of gases

(a)

Viscosity

(b)

Density

(c)

Diffusion

(d)

None

6. The values of ΔH and ΔS for a reaction are respectively 30 kJ mol-1 and 100 JK-1 mol-1. Then the temperature above which the reaction will become spontaneous is

(a)

300 K

(b)

30 K

(c)

100 K

(d)

200 C

7. A 20 litre container at 400 K contains CO2 (g) at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO2 attains its maximum value will be:
Given that: SrCO3 (S) ⇌ SrO (S) + CO2(g)
KP = 1.6 atm

(a)

2 litre

(b)

5 litre

(c)

10 litre

(d)

4 litre

8. Assertion: An ideal solution obeys Raoults Law
Reason: In an ideal solution, solvent-solvent, as well as solute-solute interactions, are similar to solute-solvent interactions.

(a)

both assertion and reason are true and reason is the correct explanation of assertion

(b)

both assertion and reason are true but reason is not the correct explanation of assertion

(c)

assertion is true but reason is false

(d)

both assertion and reason are false

9. The percentage of s-character of the hybrid orbitals in methane, ethane, ethene and ethyne are respectively

(a)

25, 25, 33, 3, 50

(b)

50, 50, 33, 3, 25

(c)

50, 25, 33, 3, 50

(d)

50, 25, 25, 50

10. Assertion:  is 3– carbethoxy -2- butenoicacid
Reason: The principal functional group gets lowest number followed by double bond (or) triple bond.

(a)

both the assertion and reason are true and the reason is the correct explanation of assertion

(b)

both assertion and reason are true and the reason is not the correct explanation of assertion

(c)

ssertion is true but reason is false

(d)

both the assertion and reason are false